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Copy pathdevice.cc
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242 lines (201 loc) · 8.34 KB
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
#include "arrow/device.h"
#include <cstring>
#include <utility>
#include "arrow/buffer.h"
#include "arrow/io/memory.h"
#include "arrow/result.h"
#include "arrow/util/logging.h"
namespace arrow {
MemoryManager::~MemoryManager() {}
Device::~Device() {}
#define COPY_BUFFER_SUCCESS(maybe_buffer) \
((maybe_buffer).ok() && *(maybe_buffer) != nullptr)
#define COPY_BUFFER_RETURN(maybe_buffer, to) \
if (!maybe_buffer.ok()) { \
return maybe_buffer; \
} \
if (COPY_BUFFER_SUCCESS(maybe_buffer)) { \
DCHECK_EQ(*(**maybe_buffer).device(), *to->device()); \
return maybe_buffer; \
}
Result<std::shared_ptr<Buffer>> MemoryManager::CopyBuffer(
const std::shared_ptr<Buffer>& buf, const std::shared_ptr<MemoryManager>& to) {
const auto& from = buf->memory_manager();
auto maybe_buffer = to->CopyBufferFrom(buf, from);
COPY_BUFFER_RETURN(maybe_buffer, to);
// `to` doesn't support copying from `from`, try the other way
maybe_buffer = from->CopyBufferTo(buf, to);
COPY_BUFFER_RETURN(maybe_buffer, to);
if (!from->is_cpu() && !to->is_cpu()) {
// Try an intermediate view on the CPU
auto cpu_mm = default_cpu_memory_manager();
maybe_buffer = from->ViewBufferTo(buf, cpu_mm);
if (!COPY_BUFFER_SUCCESS(maybe_buffer)) {
// View failed, try a copy instead
// XXX should we have a MemoryManager::IsCopySupportedTo(MemoryManager)
// to avoid copying to CPU if copy from CPU to dest is unsupported?
maybe_buffer = from->CopyBufferTo(buf, cpu_mm);
}
if (COPY_BUFFER_SUCCESS(maybe_buffer)) {
// Copy from source to CPU succeeded, now try to copy from CPU into dest
maybe_buffer = to->CopyBufferFrom(*maybe_buffer, cpu_mm);
if (COPY_BUFFER_SUCCESS(maybe_buffer)) {
return maybe_buffer;
}
}
}
return Status::NotImplemented("Copying buffer from ", from->device()->ToString(),
" to ", to->device()->ToString(), " not supported");
}
Result<std::unique_ptr<Buffer>> MemoryManager::CopyNonOwned(
const Buffer& buf, const std::shared_ptr<MemoryManager>& to) {
const auto& from = buf.memory_manager();
auto maybe_buffer = to->CopyNonOwnedFrom(buf, from);
COPY_BUFFER_RETURN(maybe_buffer, to);
// `to` doesn't support copying from `from`, try the other way
maybe_buffer = from->CopyNonOwnedTo(buf, to);
COPY_BUFFER_RETURN(maybe_buffer, to);
return Status::NotImplemented("Copying buffer from ", from->device()->ToString(),
" to ", to->device()->ToString(), " not supported");
}
Result<std::shared_ptr<Buffer>> MemoryManager::ViewBuffer(
const std::shared_ptr<Buffer>& buf, const std::shared_ptr<MemoryManager>& to) {
if (buf->memory_manager() == to) {
return buf;
}
const auto& from = buf->memory_manager();
auto maybe_buffer = to->ViewBufferFrom(buf, from);
COPY_BUFFER_RETURN(maybe_buffer, to);
// `to` doesn't support viewing from `from`, try the other way
maybe_buffer = from->ViewBufferTo(buf, to);
COPY_BUFFER_RETURN(maybe_buffer, to);
return Status::NotImplemented("Viewing buffer from ", from->device()->ToString(),
" on ", to->device()->ToString(), " not supported");
}
#undef COPY_BUFFER_RETURN
#undef COPY_BUFFER_SUCCESS
Result<std::shared_ptr<Buffer>> MemoryManager::CopyBufferFrom(
const std::shared_ptr<Buffer>& buf, const std::shared_ptr<MemoryManager>& from) {
return nullptr;
}
Result<std::shared_ptr<Buffer>> MemoryManager::CopyBufferTo(
const std::shared_ptr<Buffer>& buf, const std::shared_ptr<MemoryManager>& to) {
return nullptr;
}
Result<std::unique_ptr<Buffer>> MemoryManager::CopyNonOwnedFrom(
const Buffer& buf, const std::shared_ptr<MemoryManager>& from) {
return nullptr;
}
Result<std::unique_ptr<Buffer>> MemoryManager::CopyNonOwnedTo(
const Buffer& buf, const std::shared_ptr<MemoryManager>& to) {
return nullptr;
}
Result<std::shared_ptr<Buffer>> MemoryManager::ViewBufferFrom(
const std::shared_ptr<Buffer>& buf, const std::shared_ptr<MemoryManager>& from) {
return nullptr;
}
Result<std::shared_ptr<Buffer>> MemoryManager::ViewBufferTo(
const std::shared_ptr<Buffer>& buf, const std::shared_ptr<MemoryManager>& to) {
return nullptr;
}
// ----------------------------------------------------------------------
// CPU backend implementation
namespace {
const char kCPUDeviceTypeName[] = "arrow::CPUDevice";
}
std::shared_ptr<MemoryManager> CPUMemoryManager::Make(
const std::shared_ptr<Device>& device, MemoryPool* pool) {
return std::shared_ptr<MemoryManager>(new CPUMemoryManager(device, pool));
}
Result<std::shared_ptr<io::RandomAccessFile>> CPUMemoryManager::GetBufferReader(
std::shared_ptr<Buffer> buf) {
return std::make_shared<io::BufferReader>(std::move(buf));
}
Result<std::shared_ptr<io::OutputStream>> CPUMemoryManager::GetBufferWriter(
std::shared_ptr<Buffer> buf) {
return std::make_shared<io::FixedSizeBufferWriter>(std::move(buf));
}
Result<std::unique_ptr<Buffer>> CPUMemoryManager::AllocateBuffer(int64_t size) {
return ::arrow::AllocateBuffer(size, pool_);
}
Result<std::shared_ptr<Buffer>> CPUMemoryManager::CopyBufferFrom(
const std::shared_ptr<Buffer>& buf, const std::shared_ptr<MemoryManager>& from) {
return CopyNonOwnedFrom(*buf, from);
}
Result<std::unique_ptr<Buffer>> CPUMemoryManager::CopyNonOwnedFrom(
const Buffer& buf, const std::shared_ptr<MemoryManager>& from) {
if (!from->is_cpu()) {
return nullptr;
}
ARROW_ASSIGN_OR_RAISE(auto dest, ::arrow::AllocateBuffer(buf.size(), pool_));
if (buf.size() > 0) {
memcpy(dest->mutable_data(), buf.data(), static_cast<size_t>(buf.size()));
}
return std::move(dest);
}
Result<std::shared_ptr<Buffer>> CPUMemoryManager::ViewBufferFrom(
const std::shared_ptr<Buffer>& buf, const std::shared_ptr<MemoryManager>& from) {
if (!from->is_cpu()) {
return nullptr;
}
return buf;
}
Result<std::shared_ptr<Buffer>> CPUMemoryManager::CopyBufferTo(
const std::shared_ptr<Buffer>& buf, const std::shared_ptr<MemoryManager>& to) {
return CopyNonOwnedTo(*buf, to);
}
Result<std::unique_ptr<Buffer>> CPUMemoryManager::CopyNonOwnedTo(
const Buffer& buf, const std::shared_ptr<MemoryManager>& to) {
if (!to->is_cpu()) {
return nullptr;
}
ARROW_ASSIGN_OR_RAISE(auto dest, ::arrow::AllocateBuffer(buf.size(), pool_));
if (buf.size() > 0) {
memcpy(dest->mutable_data(), buf.data(), static_cast<size_t>(buf.size()));
}
return std::move(dest);
}
Result<std::shared_ptr<Buffer>> CPUMemoryManager::ViewBufferTo(
const std::shared_ptr<Buffer>& buf, const std::shared_ptr<MemoryManager>& to) {
if (!to->is_cpu()) {
return nullptr;
}
return buf;
}
std::shared_ptr<MemoryManager> default_cpu_memory_manager() {
static auto instance =
CPUMemoryManager::Make(CPUDevice::Instance(), default_memory_pool());
return instance;
}
std::shared_ptr<Device> CPUDevice::Instance() {
static auto instance = std::shared_ptr<Device>(new CPUDevice());
return instance;
}
const char* CPUDevice::type_name() const { return kCPUDeviceTypeName; }
std::string CPUDevice::ToString() const { return "CPUDevice()"; }
bool CPUDevice::Equals(const Device& other) const {
return other.type_name() == kCPUDeviceTypeName;
}
std::shared_ptr<MemoryManager> CPUDevice::memory_manager(MemoryPool* pool) {
return CPUMemoryManager::Make(Instance(), pool);
}
std::shared_ptr<MemoryManager> CPUDevice::default_memory_manager() {
return default_cpu_memory_manager();
}
} // namespace arrow